李雷偶然看到了保罗化学实验报告单上的分数。
Li Lei happened to see Paul's mark on the report of a chemistry experiment.
休息时，李雷看到保罗化学实验报告单上的分数。
During the break, Li Lei happened to see Paul's mark on the report of a chemical experiment.
休息时，李雷看到保罗化学实验报告单上的分数。
During the break, Li Lei happened to see Paul's mark on the report of a chemical experiment.
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